Dado Blades...

The stacked variety is the only accurate way to go, dont forget to get an extra pack of shims for the set, youll thank me later. By the way I have had the same Rigid table saw for ten years and I love it! The wobble does put undue stress on the carrier bearings for the blade shaft.
I agree if you are making shelves and need to clamp two pieces side by side get a good router and a 1/2" dado set for it,
Andrew